Place all ingredients in slow cooker and set to low setting. Cook for 6-8 hours on low. Once the beef is done cooking, remove from crockpot and shred using two forks. Cover with remaining sauce to keep it moist and flavorful. Season with salt and pepper to taste.
To make in Instant Pot:
To cook a 3 lb. roast, turn on the instant pot to pressure cook on high. Set for 60 minutes for a 3-pound roast (70 minutes for a 4-lb roast). Add all ingredients. Place lid on the instant pot and turn to the locked position and ensure the vent is set to the sealed position. When the cooking time is complete, let the instant pot de-pressurize for 10 minutes. After 1- minutes, turn vent to the venting release position allow the steam to vent before removing the lid. Remove roast from pot and shred. Cover with sauce to keep it nice and moist. Season with salt and pepper to taste.
Serve with parmesan mashed potatoes and vegetables or serve it on a sandwich.